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12 results on '"Cross, Andrew M."'

1. Synthesis of Interleaved, Unipolar, Switched Capacitor DC–DC Converters

Author

Taghizadeh, Hassan, Cross, Andrew M., Narayanan, Nakul K., and Urquhart, A.

Abstract

Switched capacitor (SC) dc–dc converters are showing great potential for new applications such as data centres, electric vehicles, and power transmission. Many SC topologies have been synthesized on an ad-hoc basis, although new computer methods are being introduced to formalize this process. This article presents a general synthesis technique that can be incorporated into a computer algorithm to assist with the development of new SC circuits. The technique is based on interleaving SC converter circuits, where two unipolar converters are connected in parallel, and each leg is driven by separate, complementary gate signals. By applying this method to the traditional Ladder SC converter, a topology termed a simplified interleaved ladder (SIL) converter, is synthesized and tested using a hardware prototype. The resonant implementation of the SIL converter has desirable features for MV/LV applications when compared with other existing SC circuits.

Published
2024
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3. Negative input-resistance compensator for a constant power load

Author

Liu, Xinyun, Forsyth, Andrew J., and Cross, Andrew M.

Subjects
Brushless electric motors -- Design and construction, Impedance (Electricity) -- Control, Industrial electronics -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A negative input-resistance compensator is designed to stabilize a power electronic brushless dc motor drive with constant power-load characteristics. The strategy is to feed a portion of the changes in the dc-link voltage into the current control loop to modify the system input impedance in the midfrequency range and thereby to damp the input filter. The design process of the compensator and the selection of parameters are described. The impact of the compensator is examined on the motor-controller performance, and finally, the effectiveness of the controller is verified by simulation and experimental testing. Index Terms--Brushless dc motor drive, negative input-impedance instability.

Published
2007

4. A high-power-factor, three-phase isolated ac-dc converter using high-frequency current injection

Author

Cross, Andrew M. and Forsyth, Andrew J.

Subjects
Electric current converters -- Research, Electric current converter, Business, Electronics, Electronics and electrical industries
Abstract

A single-stage, three-phase ac-to-dc converter topology is proposed for high-frequency power supply applications. The principal features of the circuit include continuous current operation of the three ac input inductors, inherent shaping of the input currents, resulting in high power factor, a transformer isolated output, and only two active devices are required, both soft-switched. Resonant conversion techniques are used, and a high power factor is achieved by injecting high-frequency currents into the three-phase rectifier, producing a high frequency modulation of the rectifier input voltages. The current injection principle is explained and the system operation is confirmed by a combination of simulation and experimental results. Index Terms--AC-DC power conversion, harmonic analysis, harmonic distortion, power electronics, resonant power conversion.

Published
2003

6. Isoengine promises 60 per cent efficiency. (Diesel & Gas Engine Developments)

Author

Coney, Mike W., Linnemann, Claus, and Cross, Andrew M.

Subjects
Engines -- Product development, Business, Petroleum, energy and mining industries
Abstract

A new engine concept using isothermal compression and isobaric combustion offers higher efficiency than a large CCGT, but in 7 MWe units, which can also provide hot water for heating. [...]

Published
2002

9. Dynamic network rating for low carbon distribution network operation:a U.K. application

Author

Yang, Jin, Bai, Xuefeng, Strickland, Dani, Jenkins, Lee, and Cross, Andrew M.

Abstract

Dynamic asset rating (DAR) is one of the number of techniques that could be used to facilitate low carbon electricity network operation. Previous work has looked at this technique from an asset perspective. This paper focuses, instead, from a network perspective by proposing a dynamic network rating (DNR) approach. The models available for use with DAR are discussed and compared using measured load and weather data from a trial network area within Milton Keynes in the central area of the U.K. This paper then uses the most appropriate model to investigate, through a network case study, the potential gains in dynamic rating compared to static rating for the different network assets - transformers, overhead lines, and cables. This will inform the network operator of the potential DNR gains on an 11-kV network with all assets present and highlight the limiting assets within each season.

Published
2015

12. Negative Input-Resistance Compensator for a Constant Power Load.

Author

Xinyun Liu, Forsyth, Andrew J., and Cross, Andrew M.

Subjects
BRUSHLESS direct current electric motors, DIRECT currents, DIRECT current circuits, ELECTRIC impedance, ELECTRIC resistance, ELECTRIC controllers, COMPUTER simulation, VOLTAGE regulators, DIGITAL electric filters, FEEDBACK control systems
Abstract

A negative input-resistance compensator is designed to stabilize a power electronic brushless dc motor drive with constant power-load characteristics. The strategy is to feed a portion of the changes in the dc-link voltage into the current control loop to modify the system input impedance in the midfrequency range and thereby to damp the input filter. The design process of the compensator and the selection of parameters are described. The impact of the compensator is examined on the motor-controller performance, and finally, the effectiveness of the controller is verified by simulation and experimental testing. [ABSTRACT FROM AUTHOR]

Published
2007
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